The NIOSH doc is focussed on continuous noise. Noise dose modelling and its associated damage/risk criteria are relevant to this type of noise but not impulse noise. With the latter, you need to keep exposure to-any- impulse events under 140dBSPL (peak).
There is a somewhat separate (and much smaller) volume of literature on impulse noise. It is much more difficult to measure and requires far more expensive gear.
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